RFR: 8158150: LogConfiguration::describe output can get truncated

[Kim Barrett]

> On May 30, 2016, at 10:52 AM, Robbin Ehn <robbin.ehn at oracle.com> wrote:
> 
> Hi all,
> 
> The log configuration string for an output can be longer than O_BUFLEN.
> The maximum size increase for each new tag set.
> 
> Webrev: http://cr.openjdk.java.net/~rehn/8158150/webrev/
> Bug: https://bugs.openjdk.java.net/browse/JDK-8158150
> 
> Tested with internal vm tests and jcmd VM.log list

Looks good.